<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>错误</title>
</head>
<style>
    body {
        margin: 0;
        padding: 0;
    }

    .main {
        position: absolute;
        width: 100%;
        height: 100%;
        /* background: linear-gradient(-45deg, #39b54a, #8dc63f); */
        background-color: #1cbbb4;
        /* #1cbbb4 */
        /* #f43f3b - #ec008c */
        /* #ff9700 - #ed1c24 */
        /* #0081ff - #1cbbb4 */
        /* #39b54a - #8dc63f */
    }

    .msg {
        position: absolute;
        top: 35%;
        width: 100%;
        text-align: center;
        height: 70px;
        line-height: 70px;
        font-family: 微软雅黑;
        font-size: 35px;
        /* font-weight: bold; */
        color: #FFFFFF;
    }

    .back {
        position: absolute;
        top: 50%;
        left: calc(50% - 100px);
        width: 200px;
        height: 50px;
        line-height: 50px;
        border-radius: 50px;
        background-color: #FFFFFF;
        text-align: center;
        color: #1cbbb4;
    }

    a {
        text-decoration: none;
    }
</style>

<body>
    <div class="main">
        <div class="msg">课程中心系统没有此用户</div>
        <div><a href="/" class="back">返回首页</a>a></div>
    </div>
</body>

</html>